(4) Stainless Steel Sq.Are U-Bolt 1/2" D X 2 1/16" W X 4 3/4L" Boat Trailer U-bolt Size: 1/2" D x 2-1/16" W x 4-3/4" L, thread length, thread length: 2-1/2" inches, suitable for 2" x 2" square beams and shafts, (order Please check the measurement size carefully before) 304 stainless steel material: U-bolts are made of 304 stainless steel, strong and durable, each bolt can withstand 100LBS You can get: (4) Ubolts, (8) heavy hex stainless steel nylon lock nuts, (8) flat washers, (8) lock washers. These are only half the price of the hardware store, with these you can spend less time repairing and more time boating Tips: It is recommended to use lubricant during installation to prevent wear. Use a hand wrench or socket ratchet when installing the nut. Do not use a high-speed power tool or impact tool to tighten the nut. After-sales service: Our U-bolts provide a one-year warranty service. If you have any questions, please feel free to send us an email via Amazon. We will solve it for you within 24 hours. Do not worry.